BIND 10 #1732: document in-memory data source use in the guide

[BIND 10 Development]

#1732: document in-memory data source use in the guide
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            Reporter:  jreed         |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  New
           Component:                |  Tasks
  documentation                      |                     Keywords:
           Sensitive:  0             |              Defect Severity:  N/A
         Sub-Project:  DNS           |  Feature Depending on Ticket:
Estimated Difficulty:  0             |          Add Hours to Ticket:  0
         Total Hours:  0             |                    Internal?:  0
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 document in-memory data source use in the guide

 include bindctl examples

 (By the way, when will the same configuration be useful for loading into
 sqlite3 also?
 Maybe we need to revisit this to consider how migration or choosing data
 sources for different auth servers, etc should be done.)

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Ticket URL: <http://bind10.isc.org/ticket/1732>
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BIND 10 Development